饰瓷对磨牙e.max双层全瓷冠断裂类型的影响  

Influence of Veneering on Failure Behavior of e.max Bi-layered All-ceramic Molar Crowns

作　　者：潘娱[1] Michael V Swain 马骁[3] 张新平[3] 赵克[1] 

机构地区：[1]中山大学光华口腔医学院.附属口腔医院修复科.口腔医学研究所,广东广州510055 [2]澳大利亚悉尼大学牙科学院及悉尼牙科医院 [3]华南理工大学材料科学与工程学院

出　　处：《口腔医学研究》2011年第2期97-100,共4页Journal of Oral Science Research

基　　金：国家自然科学基金(编号:30872908);中山大学重大项目培育和新兴;交叉学科研究项目(编号:10ykjc27)

摘　　要：目的:通过抗折破坏实验研究饰瓷对磨牙e.max双层全瓷冠断裂强度和断裂类型的影响,为减少临床双层全瓷修复体崩瓷提供实验依据。方法:制作单层全瓷冠(IPS e.max Press)和双层全瓷冠(IPS e.max Press/Ce-ram)共40个(每组20个),粘接于树脂代型后进行抗折破坏实验并记录断裂强度值;体视显微镜和扫描电子显微镜下观察断裂类型;能谱分析饰瓷-核瓷界面化学元素构成。结果:单层全瓷冠断裂强度值[(2665.4±759.2)N]与双层全瓷冠[(1431.1±404.3)N]间差异有统计学意义(P=0.000)。饰瓷内部及饰瓷-核瓷界面缺陷催生裂纹造成饰瓷崩裂是双层全瓷冠断裂的主要模式。结论:饰瓷对磨牙e.max双层全瓷冠断裂强度和断裂类型均有影响;饰瓷内部及饰瓷-核瓷界面缺陷是全瓷冠断裂的主要原因,提高饰瓷断裂强度及减少界面缺陷可减少因崩瓷造成的修复体失败。Objective：To evaluate the effect of veneering on fracture strength and failure mode of e.max bi-layered all-ceramic molar crowns,so as to provide an experimental basis for reducing veneer chipping and delamination in clinical situations.Methods：Forty all-ceramic molar crowns（IPS e.max Press） were fabricated in two groups（with and without veneering） and each group consists of twenty identical crowns.The crowns were seated on composite resin dies by adhesion and then the specimens were loaded to failure by using a universal mechanical testing machine under compressive load.Fractographic morphology and fracture mode of the failed specimens were observed by a stereomicroscope and a scanning electron microscope（SEM）,and the compositions of the veneer-core interface were analyzed by energy dispersive spectroscopy（EDS）.Result：Statistical analysis results indicated a significant difference of the mean fracture strength between mono-layered group（2665.4±759.2 N） and bi-layered group（1431.1±404.3 N,P=0.000）.The bi-layered crowns exhibited a failure mode of both types of chipping of the veneering materials due to cone cracks propagation and cohesive failure at the veneer-core interface.Conclusion：Porcelain veneering has a distinct influence on fracture strength and failure mode of bi-layered all-ceramic crowns.To exploit the high strength of the core materials,the strength of the veneering materials should be increased,as cone cracks and manufactured flaws in veneer were the most likely cause of chipping.

关 键 词：牙修复体 牙瓷料 力学 牙修复失效 

分 类 号：R783.1[医药卫生—口腔医学]